INSKCUTOR INSClTl.^i MKNSTRUUS 147 



Gonapophyses and penis-guard appearing as slender, chitinized 

 rods. Valves of ovipositor fleshy but rather elongate. 



Habitat. — New Zealand (South Island). 



Holotype, $ , Little River, Mount Fitzgerald, altitude 1,500 

 feet, January 24, 1923 (E. S. Gourlay) ; R. R. 



Allotopotype, 9 . 



The types were associated with Molophilus luteipygus Alex- 

 ander and M. banksianus Alexander, all three species being 

 preyed upon by a small species of Empididae. 



Family DIXIDAE 



The only Dixa so far described from New Zealand is 

 D. campbeUi Alexander. This may be the species mentioned, 

 but not described, by Marshall (Trans. N. Z. Inst., vol. 28, 

 p. 222, 1896), or the latter may have pertained to some other 

 still undescribed form. 

 Dixa otagensis, new species. 



Male. — Length 3.6 mm. ; wing 4.5 mm. 



Rostrum and palpi black. Antennae and head black. 



Mesonotum brown, the color almost obscured by the very 

 broad black stripes on the praescutal region ; scutellum pale 

 brown ; postnotum black. Pleura black, the mesepimeron and 

 the lateral sclerite of the postnotum obscure brownish yellow, 

 brightest ventrad of the wing-root. Halteres brown, the extreme 

 base yellow, the knobs darker. Legs with the coxae brown, the 

 posterior coxae more yellowish; trochanters yellow; remainder 

 of the legs black. Wings with a faint brownish tinge, more 

 pronounced in the costal region ; a brown cloud at the r-m 

 cross-vein ; veins dark brown. Venation : Sc-^ ending imme- 

 diately before the origin of Rs ; r-m connecting with Rs a little 

 less than its own length before the fork ; m-cu a little more 

 than its own length beyond r-m: cell M.^ deeper than in 

 D. campbelli. 



Abdomen dark brownish black. 



Habitat. — New Zealand (South Island). 



Holotype, $, Ben Lomond, Otago. December 30, 1921 (G. 

 Howes ) . 



Paratopotype, Sex?. 



